Typewriting machine



April 28, 1931. c o 1,803,125

TYPEWRITING MACHINE Filed NOV. 1. 1928 Affamey Patented Apr. 193i NITED STATES PATENT OFFICE CARL NOB-IN, OF JERSEY CITY, NEW JERSEY, ASSIGNOR T UNDERWOOD ELLIOTT FISHER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE 'rxrnwmrme MACHINE Application filed November 1, 1928. Serial 1W0. 316,418.

This invention relates to segmental stops for the type-bars of typewritlng machines, and one ob ect is to reduce the nolse made by a type-bar contacting with the same and im- 5 prove the action of the type-bar and reduce the wear.

This invention embodies a type-bar stop which is light, compact,and attractive in appearance, as well as noise reducing. Further s more, it is long lived, cheapto manufacture, and can readily be attached to a typewriter with a minimum of labor and expense.

In the design shown, a piece of hardened spring steel is stamped out in arcuate shape to form a type-bar stop which is attached to the cast-metal segment. This stop has an integral lateral base along its inner curve, by which it is fastened, and also has an inverted overhung channel supported thereby. In this channel a resilient sound-deadening material is glued to absorb vibrations, and thereby reduces the noise caused when the stop is struck by a type-bar.

This spring-steel stop is fitted over and around a solid metal stop ridge which is cast integral with the segments found in Underwood machines. In order to make this invention light, compact, and attractive in appearance, it is formed comparatively narrow, which results in a narrow inverted channel. As the channel is narrower than the present cast-metal stop-rings, the latter are planed off along their sides when this invention is used, and may also be planed ofi to make them lower. When future segments are cast, thelintegral stop-ring will be made accord- 1ng y.

In using this invention, a very small clearance is left between the sound-deadening material and the cast-metal stop-ring or rid e. This permits the steel stop-ring to glve slightly when struck by the type-bar, whereby the latteris cushioned. Should the impact be sutficiently violent, the sound-deadenin material is forced against the castmeta stop-ring,'and by its resiliency further cushions the blow.

The cast-metal stop is retained in order to limit the movement of the steel stop-ring, whereby the arm of the type-bar is quickly arrested, and a staccato impact of the type against the platen is assured. In order to prevent any buckling of the thin steel stop, its base is firmly held by an overlying metal plate that is fastened to the segment by screws, which pass through both of the at tached members. A

In the present invent-ion the stop-ring is forwardly inclined, about two or three degrees, so that the lower end extends about five or ten thousandths of an inch further away from the cast-metal stop ridge than the upper part. This inclining of the novel stopring permits the type-bar, when moving toward the platen, to first strike the lower corner of the ring. Owing to the construction of the novel'stop-ring, this point is the most yielding and will readily yield, deadening the noise of impact. I As the type-bar swings closer to the platen, it will roll upon or gradually contact with more and more of the surface of the novel stop-ring, and by the time said type-bar is about to print, full contact with the vertical surface of the novel ring will have been made. The resilient ring, in the meantime, has been pressed or flexed rearwardly flush up against the cast-metal stop ridge, so as to serve finally as a fixed abutment for the type-bar at or immediately prior to its printing. Thereby the type-bar is given the desired snap at the printing point or making the type-impression clear.

Other features and advantages will. hereinafter appear.

- In the accompanying drawings,

Figure 1 is a front view of this invention, which is shown attached to the usual segment of an Underwood typewriter.

Figure 2 is a partial side elevation of the typing action, and shows the relation between the same and this invention, which is drawn partly in cross-section.

Figure 3 is an enlarged detail view of this invention, and shows its relation to the castmetal segment and stop-ring, with the typeb ar just contacting with the resilientstoprm igure 4 is a shows the type-bar swung closer to the platen and contacting with more of the surface of;

view similar to Figure 3, but D 5 position as in Figure 2.

Referring to the drawings, keys (not shown) are operative to swing type-bars 10- upwardly and rearwardly against the front face of a platen 11. The platen is journaled in a usual carriage which is'mounted on the main frame of a typing machinepartly indicated at 12. The type-bars 10 are pivoted in slots 13 of a cast-metal type-bar segment 14, which is attached to said main frame by screws 15.

On the type-bar segment 14 is an integral stop. ring or ridge 16, ordinarily in use to arrest the arm of the. type-bar, and cause the end of the latter to snap against the platen. Partly enclosing the integral stop ridge 16 is a spring-steel stop 17, which is formed in one piece to have a flange orlateral base 18 and an inverted channel19. This channel is inclined to said stop ridge 16, so asto cause its lower resilient end to first contact with the swinging type-bar and deaden the noise of impact. This lower end of the channel is slightly rounded, as is also the bend at the base 18, where it joins the channel in order to cause a yielding contact with the type-bar, thereby preventing damage and rapid wear. This rounding is made by a gradual bend which will strengthen the edge and prevent buckling of the member, due to impact of the type-bars. A plate 20 overlies the whole of said flange, and is attached to the segment 14' by screws 21, which pass through said flange and said plate. a

The channel 19 is lined throughout its length with a resilient sound-deadening material 22, which is attached-by an adhesive. The material 22 is of such thickness as toleave a space 23 between said material and the stop-ring 16. This space 23 is slight and amounts to a clearance of but a few thousandths of an inch. This material 22, when compressed between the channel 19 and stop I 17, confines the air *in the small interstices to act as a cushion when compressed, thereby cushioning the impact of the type-bar and assists in reducing the noise and shock incident thereto. Also shown is a type-bar guide 24, which is attached to the segment 14 by screws.

In using this spring-steel stop, the vibra-, tions caused by an impacting type-bar are mostly absorbed, instead of all being transmitted to the cast-metal se ment, which acts somewhat as a sounding oard. Also this spring-steel stop is tough and durable, and will not be cut by the type-bars when they strike. -'This is an advantage over a castmet-al stop-ring, which is preferably made of softer material and in time becomes furrowed through impacts. When this happens, the

make possible .a faster operation of the ma chine.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I

claim:

1. In a typewriting machine, the combination of a platen, a segment, an integral ridge .on the segment, type-bars pivotally connected to the segment and operative to strike the platen, and a resilient metal stop-member attached to the surface of the segment, and overlying said integral ridge, to intercept the type-bars before they strike the platen.

2. In a typewriting machine, the combination of a platen, a segment, an integral ridge on the segment, type-bars pivotally connected to the segment and operative to strike the platen, and a resilient metal stop-member attached tothe surface of the segment and overlying said integral ridge, to intercept the type-bars before they strike the platen, said metal stop-member having an inverted overhung channel which has a lining of vibrationabsorbing materiaL.

3. In atypewriting machine, the combination of a platen, a segment, an integral ridge on the segment, type-bars pivotally connected to the segment and operative to strike the platen, a resilient metal stop-member having a laterally-extended base overlying said integral ridge, 9. plate which overlies the base to prevent buckling in said stop-member when struck by a type-bar, and screws passing through said stop-member and said base by which they are attached to the segment.

4. In a t pewriting machine, the combination of a pl aten, a segment, an integral ridge on the segment, type-bars pivotally connected to the segment and operative to strike the platen, and a resilient metal stop-member overlying said integral ridge and attached to the surface of the segment, tointercept the type-bars before they strike the platen, said stop-member having a lateral base which is parallel to the surface which is struck by the overhung channel which is integral with a lateral base and the channel having an attached sound-deadening material.

6. In a typewriting machine, the combination of a platen, a segment, an integral ridge on the segment, type-bars pivotally connected to the segment and operative to strike the platen, and a hardened spring steel stop-member which is attached to the segment to be struck by the type-bars, overlying said integral ridge, said stop-member having an overhung channel which is integral with a lateral base, said base and said channel having rounded corners, whereby the surface which is struck has more give and will not be dented by a violent impact of the type-bars.

7. In a typewriting machine, the combination of a platen, a segment, an integral ridge on the segment, type-bars pivotally connected to the segment and operative to strike the platen, and a hardened spring steel stopmember which is attached to the segment to be struck by the type-bars and overlying said integral ridge, said stop-member having an overhung channel which is integral with a lateral base, said base and said channel having rounded corners to prevent buckling of the steel stop-member.

8. In a typewriting machine, the combination of a platen, a segment, a stop-ring formed integrally on the segment, type-bars pivotally connected to the segment and operative tostrike the platen, a spring metal stop-member to intercept the type-bars, said stop-member having a lateral base which is fastened to the segment, an inverted channel on said stopmember, and resilient material in said channel, the latter partly surrounding the integral stop-ring and separated therefrom by a clearance space which permits said spring metal stop-member to give slightly when struck by the type-bars, whereby the latter are cushioned to reduce noise therefrom and strains therein.

9. In a typewriting machine, the combination of a platen, a segment, a stop-ring formed integrally on thesegment, type-bars'pivotally connected to the segment and operative to strike the platen, a spring metal stop-member to intercept the t pe-bars, said stop-member having a lateral base which is fastened to the segment, an inverted channel on said stop-member, and resilient material in said channel, said material slightly separated from said integral stop-ring, and which can abut the latter when the sprin metal stop is violently struck by the typears, whereby said integral stop will limit the movement of the spring steel stop. 1

10. In a typewriting machine, the combina tion of a platen, a segment, an integral ridge on the segment, type-bars operative to strike the platen, a spring steel stop-member to intercept the type-bars and fastened to the segment, an inverted channel on said stop-111cm ber, and resilient material in said channel which is opposed to said ridge and which is compressible against the latter when said stop is struck by the type-bars, whereby the'latter are cushioned.

11. In a typewriting machine, the combination of a platen, a segment, an integral ridge on the segment, type-bars operative to strike the platen, and a piece of spring steel fastened to the segment, said spring steel overlying and separated from the ridge, said spring steel acting as a cushion when struck by the type-bars, and said ridge acting as a stop for the spring steel when the latter is violently struck, to reduce the impact of the type-bars against the platen.

12. In a typewriting machine, the combination of a platen, a segment, an integral ridge on the segment, type-bars operative to strike the platen, a spring steel stop-member to intercept the type-bars and fastened to the segment, an inverted channel on said stop-member, resilient material in said channel which is compressible against said ridge when said stop-member is struck by the type-bars and the ridge, and sealing interstices in said material, to confine the air therein to act as a cushion when compressed, whereby the impact of the type-bars is cushioned, and noise and shocks are reduced.

13. In a typewriting machine, the combination of a platen, a segment, an integral ridge on the segment, type-bars operative to strike the platen, a spring steel stop-member to intercept the type-bars and fastened to the segment, an inverted channel on said stopmember, and resilient material in said channel which is opposed to said ridge and which is compressible against the latter when said stop is struck by the type-bars, after which the tension in said stop is exerted to restore the type-bars to normal positions.

14. In a typewriting machine, the combination of a platen, a segment, an integral rid e on the segment, type-bars operative to stri e the platen, a spring steel stop-member to intercept the type-bars and overlying said integral ridge, a plate, said stop-member and 

